A bare-bones chunk of iron! And just as reliable! Use this single supply for all your low-voltage AC needs. Connect between an end and the center tap for 12VACand between both ends for 24VAC. Use the 24VAC to power all your thermostats, dampers, and doorbell. Use the 12VAC for all those other devices that need that voltage. For a really slick setup, use with one or more PD9's (below) for distribution.